head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Optimization · Practiced Mastery
An accessible action RPG of moral choices, property empires, and a loyal dog.

Optimization · Practiced Mastery
A real-time RPG carried by ascension-grid routing and magic crafting.
Fable II leans Optimization (Practiced Mastery); Final Fantasy XV leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Fable II
One-button combat, forgiving by design
Final Fantasy XV
Real-time combat, modest input demand
Final Fantasy XV leans a little harder on reads, though the gap is small.
Fable II
Scripted opposition
Final Fantasy XV
Scripted enemies
Final Fantasy XV leans a little harder on variance, though the gap is small.
Fable II
Fixed world with minor loot rolls
Final Fantasy XV
Loot and ascension variance
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Fable II
Property empire and job economy trivially exploitable
Final Fantasy XV
Ascension grid, magic crafting, party planning
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.